[![Build status](https://travis-ci.org/PolymerElements/iron-dropdown.svg?branch=master)](https://travis-ci.org/PolymerElements/iron-dropdown) _[Demo and API docs](https://elements.polymer-project.org/elements/iron-dropdown)_ ##<iron-dropdown> `` is a generalized element that is useful when you have hidden content (`.dropdown-content`) that is revealed due to some change in state that should cause it to do so. Note that this is a low-level element intended to be used as part of other composite elements that cause dropdowns to be revealed. Examples of elements that might be implemented using an `iron-dropdown` include comboboxes, menubuttons, selects. The list goes on. The `` element exposes attributes that allow the position of the `.dropdown-content` relative to the `.dropdown-trigger` to be configured. ```html
Hello!
 ``` In the above example, the `
` with class `.dropdown-content` will be hidden until the dropdown element has `opened` set to true, or when the `open` method is called on the element.